initial multi user feature

app/lib/features/user/domain/repositories/profile.dart

@@ -0,0 +1,57 @@
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:uuid/uuid.dart';
+import 'package:weblibre/core/filesystem.dart';
+
+import 'package:weblibre/domain/entities/profile.dart';
+
+part 'profile.g.dart';
+
+@Riverpod(keepAlive: true)
+class ProfileRepository extends _$ProfileRepository {
+  Future<List<Profile>> _readProfiles() {
+    return filesystem.getAvailableProfileDirectories().then((dirs) async {
+      final profiles = await Future.wait(
+        dirs.map(filesystem.readProfileMetadata),
+      );
+      return profiles.nonNulls.toList();
+    });
+  }
+
+  Future<void> switchProfile(String id) async {
+    await filesystem.setStartupProfile(UuidValue.withValidation(id));
+  }
+
+  Future<Profile> createProfile({required String name}) async {
+    final profile = Profile.create(name: name);
+    if (!await filesystem.createNewProfile(profile)) {
+      throw Exception('Could not create profile');
+    }
+
+    state = await AsyncValue.guard(_readProfiles);
+
+    return profile;
+  }
+
+  Future<void> updateProfileMetadata(Profile profile) async {
+    await filesystem.updateProfileMetadata(profile);
+    state = await AsyncValue.guard(_readProfiles);
+  }
+
+  Future<bool> deleteProfile(String id) async {
+    final uuid = UuidValue.withValidation(id);
+    if (filesystem.selectedProfile == uuid) {
+      return false;
+    }
+
+    await filesystem.getProfileDir(uuid).delete(recursive: true);
+
+    state = await AsyncValue.guard(_readProfiles);
+
+    return true;
+  }
+
+  @override
+  Future<List<Profile>> build() {
+    return _readProfiles();
+  }
+}